glaze chemical question

Hello Everyone, I have a recipe for Green Celedon glaze cone 4-6 oxidation:

f 4 spar 38 whiting 14 zinc oxide 12 ball clay 6 flint 30

copper 0.5

My question is does anyone know what kind of copper this would be? I'm looking at my supply catalog and they list copper carbonate, copper oxide,black and copper oxide,red. I don't know which to get. Thank you for any help on this.

Red Deer

Reply to
Red Deer
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Possibly copper carbonate; oxide is stronger and I think would make it rather too green for a celadon, which are usually quite subtle (at least the ones that I like are!).

Steve Bath UK

In article , Red Deer writes

Reply to
Steve Mills

I agree :o) Annemarie

Reply to
annemarie

I'm wondering if you might want to throw in just a touch of iron to mute the turquoise I would think you would get......?

P.S. I agree that it would be copper carb.

Reply to
DKat

Reply to
A & V

I agree that a true Celdon is produced by small amounts of iron oxide in a reduction kiln, however I believe this recipe is simulating the color and possibly the translucency of Celadon in an Oxidation kiln.

I would also guess that C> I thought that celadon is coloured by hint of iron and fired in

reduction

Reply to
btpanek09

True celadon is colored from iron in reduction but this is an oxidation firing and is supposed to be a celadon look alike. Copper goes a pretty turquoise with Calcium. To me celadon at it's very best is a sea green but slightly muted - not a bright intense color. I have seen it from almost a clear dark olive green to milky pale blue/green to what I favor which is in the middle. It was just a thought that a tiny bit of iron would add enough red to make it more celadon like.

Reply to
DKat

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